They are as long as the current infrastructure endures, and they are charged up for a days use. Like the phones they pair with must also be charged up for a days use. I don't honestly know what the outcome would be or how you could challenge a mechanical vs electronic smart watch in a durability match. They are oranges and apples in difference and sorry for the reference. :blushing:If anything "smartwatches" are EXACTLY that - durable and ultra reliable!